SOLUTION: Solve the following proportion for : {{{-15/x = -21/x-2}}} Now this one i am not at all sure of where to start.

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Question 225158: Solve the following proportion for :
-15%2Fx+=+-21%2Fx-2
Now this one i am not at all sure of where to start.
Answer by LtAurora(115) About Me  (Show Source):
You can put this solution on YOUR website!
Cross multiply! :-D
-15%2Fx+=+-21%2Fx-2
This gives us:
-15%2A%28x-2%29=-21%2Ax
Distribute the -15:
-15x%2B30=-21x
Move the -15x to the other side:
30=-6x
Divide both sides by -6:
x=-5
Yay!